Early Electronic Calculator Desktop Calculator Photo Gallery

Miida MC840 1972 Logic Technology: LSI-3 Memory Technology: LSI Display: VFM A straighforward little desktop in terms of functionality, but a sleek and stylish wedge-shape case design. The same case is shared by the MC1214. Electronically, this model is very similar to a predecessor, the MC800. The chipsets are nearly identical and the keyboard construction is the same. The display tubes and display drivers are different.

Rapidman 1208 LC 1972 Logic Technology: LSI-3 Memory Technology: LSI Display: LCD This model is notable for very early use of an LCD display. Too early one might say, all 3 of the units in my possession utilising these displays have only partially operable displays, bubbles having developed in the liquid crystal. The same electronics as the Lloyd's Accumatic 70 but packaged in a different case. See the Lloyd's 70 for the schematic.

Toshiba BC-0802 1972 Logic Technology: LSI Memory Technology: LSI Display: VFI

Wang 520 1972 Logic Technology: SSI,MSI Memory Technology: LSI Display: NIX No, this model did not originally come in a solid wood case. This was another unit, like the Casio AL-1000, received in an incomplete state. The case, printer and cassette deck were missing. Fortunately, what remained - the keyboard, main chassis and core-rope ROM board - were enough to make a functioning calculator. The wooden case was constructed to hold it all together and protect the delicate core-rope ROM. This model and other related 500,600,700-series Wang models use a microcoded design to deal with the level of complexity and features. They were developed just before the introduction of LSI ROM, the microcode store is instead a form of core-rope ROM. A technical description of the ROM is presented in an article about core rope ROM.

Addmaster Simplex 12 1973 Logic Technology: LSI-2 Memory Technology: LSI Display: PPX2

Commodore US*1 1973 Logic Technology: LSI Memory Technology: LSI Display: PPX2

Commodore US*10 1973 Logic Technology: LSI Memory Technology: LSI Display: PPX2

Eldorado 8K 1973 Logic Technology: LSI Memory Technology: LSI Display: PPX2

Facit 1114J 1973 Logic Technology: LSI Memory Technology: LSI Display: VFI A cute, solidly-built little model, but this unit developed a problem years ago. There's no display visible in the photo because there's nothing in there - it's an empty case. As a kid I pilfered the display tubes and transformer from this unit to make a digital clock. The clock is doing just fine, it's been running almost continuously for 30 years now.

Lloyd's Accumatic 70 1973 Logic Technology: LSI-3 Memory Technology: LSI Display: LCD Same electronics (and problems with the LCD display) as the Rapidman 1208LC, but different case.

Rapidman 1220 1973 Logic Technology: LSI-2 Memory Technology: LSI Display: PPX2

Sharp ELSI 804 1973 Logic Technology: LSI Memory Technology: LSI Display: VFI